These structures prevent prolapse of the atrioventricular valves.
A. Chordae tendineae
B. Crista terminalis
C. Trabeculae carneae
D. Intercalated discs
Answer: A. Chordae tendineae
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The layer of the heart wall composed of cardiac muscle tissue is the
A. myocardium. B. endocardium. C. pericardial cavity. D. pericardium. E. pectinate muscle.
Red blood cells are formed by the process of ________.
Fill in the blank(s) with the appropriate word(s).
Arrange the following events of coagulation in proper sequence.(1) Prothrombin ? thrombin(2) Fibrinogen ? fibrin(3) Activation of factor XII(4) Formation of prothrombinase
A. 1, 2, 3, 4 B. 2, 4, 3, 1 C. 4, 3, 1, 2 D. 3, 2, 4, 1 E. 3, 4, 1, 2
When acetylcholinesterase outlasts the release of acetylcholine from the synaptic vesicles, the skeletal muscle ________
A) contracts B) gets stronger C) relaxes D) opens its Na+ channels E) releases Ca++